fixed issue 1696:webclient not built to handle lists, thanks Yair

VERSION

@@ -1 +1 @@
-Version 2.6.4-stable+timestamp.2013.09.27.13.07.13
+Version 2.6.4-stable+timestamp.2013.10.01.15.24.15

gluon/contrib/webclient.py

@@ -48,6 +48,18 @@ class WebClient(object):
         self.sessions = {}
         self.session_regex = session_regex and re.compile(session_regex)
 
+    def web2py_url_encode(self, data):
+        output = []
+        for var in data:
+            val = data[var]
+            if type(val)==list:
+                for item in val:
+                    output += ['%s=%s' % (urllib.quote_plus(var), urllib.quote_plus(item)),]
+            else:
+                output += ['%s=%s' % (urllib.quote_plus(var), urllib.quote_plus(val)),]
+        
+        return '&'.join(output)
+    
     def get(self, url, cookies=None, headers=None, auth=None):
         return self.post(url, data=None, cookies=cookies,
                          headers=headers, method='GET')
@@ -119,7 +131,7 @@ class WebClient(object):
                     data['_formkey'] = self.forms[data['_formname']]
 
                 # time the POST request
-                data = urllib.urlencode(data)
+                data = self.web2py_url_encode(data)
             else:
                 self.method = 'GET' if method=='auto' else method
                 data = None